--- 8a223a48802c0c867f79818045399937e650bf5e
+++ 5f9315b32a42aed67da57a7de2caf97bfdcb8fd1
@@ -162,7 +162,7 @@ static inline sector_t get_dev_size(stru
 static inline chunk_t sector_to_chunk(struct dm_exception_store *store,
 				      sector_t sector)
 {
-	return (sector & ~store->chunk_mask) >> store->chunk_shift;
+	return sector >> store->chunk_shift;
 }
 
 int dm_exception_store_type_register(struct dm_exception_store_type *type);